The SF Giants bullpen has spent the past 11 months looking like a unit searching for itself. Before the Tyler Rogers trade, it carried a 3.26 ERA and ranked second in baseball. Since then, it has posted a 4.28 ERA, fallen to 20th, and cycled through relievers without finding a lasting answer. Caleb Kilian is part of that larger story, because the problem has not been one move so much as a steady erosion of late-inning stability.
That is what makes the Tyler Rogers trade such an important inflection point. It did not cause every issue on its own, but it came at a time when the bullpen lost two of its most recognizable late-game arms, with Camilo Doval also dealt at the deadline. From there, the Giants were forced to patch together innings while personnel losses kept piling up.
The deeper concern is that the decline has not been a short-term wobble. The numbers show a clear before-and-after split: a bullpen that was once elite has become merely middle of the pack, and then worse than that. A 4.28 ERA does not just reflect bad luck or one rough series. It usually points to a group that is giving up more traffic, more leverage situations and more chances for games to swing the wrong way.
There is also a clear human cost to that drift. Randy Rodríguez's Tommy John surgery and Erik Miller's elbow sprain have thinned the group further, making it harder for the Giants to recover the late-inning shape they had before the deadline. In that sense, the Tyler Rogers trade is less a full explanation than the moment when a fragile structure became a noticeably weaker one.
Rogers himself has been part of the contrast. He signed a three-year, $37 million pact with the Toronto Blue Jays that includes a team option for a fourth year, and in his first season there he has delivered a 1.77 ERA in 42 appearances. For the Giants, that only sharpens the question of what was lost when the bullpen's best version was broken apart.
So the Caleb Kilian angle is not really about one pitcher changing the entire picture. It is about a roster in which the bullpen has been asked to absorb repeated losses and has not yet found a reliable replacement for what it used to be. The Giants once had a relief group that could support a contender. Since the Tyler Rogers trade, they have looked like a team still trying to rebuild that advantage one outing at a time.
